Sealing structure and air compressor

Abstract

The utility model relates to the field of air compressors, in particular to a sealing structure and an air compressor, which are used for sealing and assembling an air cylinder (1) on a shell (2), and are characterized in that the shell (2) is provided with a mounting groove and comprises a shell positioning surface (23), a sealing surface (23) and a sealing surface (23), and the shell positioning surface (23) is propped against the air cylinder (1) so as to assemble and position the air cylinder (1); and the sealing matching surface (22) is connected with the air cylinder (1) in a sealing manner. In the utility model, a shell positioning surface (23) which is arranged on a shell (2) and is propped against the air cylinder (1) is used for assembling and positioning the air cylinder (1); and the sealing between the shell (2) and the air cylinder (1) is realized by a sealing matching surface (22) which is in sealing connection with the air cylinder (1).

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor field especially is sealed structure and air compressor. BACKGROUND

[0002] Some air compressors on the market, its cylinder and shell adopt contact type hard sealing, or through the way of over tight fit between the contact surface, there is leakage and the problem of air flow noise caused by leakage. INNOVATIVE CONTENT

[0003] The utility model aims at the problem in the background art, proposes a sealed structure and air compressor convenient to assemble, good sealing, not easy to leak and not easy to produce air flow noise.

[0004] The utility model discloses a sealed structure for cylinder sealing assembly to shell, and the shell is provided with mounting groove, which comprises:

[0005] Shell positioning surface, which is in abutment with the cylinder to assemble and position the cylinder;

[0006] Sealing matching surface, which is sealingly connected with the cylinder.

[0007] Preferably, the shell positioning surface is arranged on the bottom surface of the shell mounting groove and is in abutment with the lower surface of the lower part of the cylinder to assemble and position the cylinder.

[0008] Preferably, the lower part of the cylinder is provided with a stepped surface, and the shell positioning surface is arranged on the top end surface of the shell and is in abutment with the stepped surface of the lower part of the cylinder to assemble and position the cylinder.

[0009] Preferably, the sealing matching surface is arranged on the side surface of the shell mounting groove.

[0010] Preferably, the sealing matching surface is arranged on the bottom surface of the shell mounting groove.

[0011] Preferably, a sealing ring or sealing material is arranged between the sealing matching surface and the cylinder to realize the sealing connection between the cylinder and the shell.

[0012] Preferably, the outer circumferential surface of the cylinder or the inner side surface of the shell mounting groove is provided with a sealing groove for accommodating the sealing ring or sealing material.

[0013] Preferably, the depth of the sealing groove is less than or equal to 50% of the wall thickness of the cylinder or the shell mounting groove.

[0014] Preferably, the lower part of the cylinder is provided with a stepped surface, and the stepped surface has a gap with the top end surface of the shell.

[0015] Preferably, the bottom surface of the mounting groove has a gap with the lower surface of the lower part of the cylinder.

[0016] Preferably, a guide bevel is arranged at the opening of the under-cylinder part and / or the housing mounting groove.

[0017] The utility model discloses a kind of air compressors, including cylinder and shell, the cylinder is sealed to the shell by the sealing structure in any of the foregoing technical solutions.

[0018] Compared with prior art, the utility model has the following beneficial technical effects:

[0019] (1) in the utility model, the shell positioning surface of shell abutting with cylinder is assembled and positioned to cylinder;Sealing surface of sealing connection with cylinder realizes the sealing between shell and cylinder.

[0020] (2) the utility model can make cylinder and shell convenient to assemble, good sealing, not leak and not produce airflow noise;Cylinder and shell can be accurately positioned and assembled, and sealing ring can realize effective sealing between cylinder and shell. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is structural schematic view of the utility model embodiment one;

[0022] Figure 2 It is structural sectional view of the utility model embodiment one;

[0023] Figure 3 It is Figure 2 the structure enlarged view of place A in;

[0024] Figure 4 It is structural sectional view of the utility model embodiment two;

[0025] Figure 5 It is Figure 4 the structure enlarged view of place B in;

[0026] Figure 6 It is structural sectional view of the utility model embodiment three;

[0027] Figure 7 It is Figure 6 the structure enlarged view of place C in.

[0028] Reference signs: 1, cylinder;101, sealing groove;2, shell;21, guide bevel;22, sealing surface;23, shell positioning surface;3, sealing ring. DETAILED DESCRIPTION

[0029] As Figures 1-7As shown, the sealing structure of the present application is used for sealing assembly of the cylinder 1 to the housing 2, the housing 2 is provided with a mounting groove, the housing 2 is a structure for realizing certain functions by the cylinder 1, and the housing (such as the housing of an air compressor) is not referred to as the housing surrounding the cylinder 1.

[0030] The sealing structure specifically comprises: the housing 2 has a sealing fitting surface 22 and a housing positioning surface 23; wherein the housing positioning surface 23 abuts against the cylinder 1 to position and assemble the cylinder 1; and the sealing fitting surface 22 is sealingly connected with the cylinder 1.

[0031] The connecting structure for realizing fastening between the cylinder 1 and the housing 2 of the present application is not specifically limited.

[0032] Embodiment one

[0033] As shown in Figure 2 and 3 , the mounting groove is formed along the opening edge of the housing 2 communicating with the cylinder 1, and has a circular annular bottom surface and an inner side surface; the housing positioning surface 23 is arranged on the bottom surface of the mounting groove of the housing 2, and abuts against the lower surface of the lower part of the cylinder 1 to position and assemble the cylinder 1.

[0034] Optionally, the lower part of the cylinder 1 is provided with a stepped surface; the lower part of the cylinder 1 is adapted to the mounting groove of the housing 2 as a first outer diameter section, the main body of the cylinder 1 is a second outer diameter section, the diameter of the first outer diameter section is smaller than that of the second outer diameter section, and the stepped surface is a transition surface between the second outer diameter section and the first outer diameter section. In this embodiment, there is a gap between the stepped surface of the cylinder 1 and the top end surface of the housing 2, and the mounting and positioning of the cylinder 1 and the housing 2 are only realized by the bottom end surface of the cylinder 1. The sealing fitting surface 22 is arranged on the side surface of the mounting groove of the housing. The outer circumferential surface of the cylinder 1 coaxially arranged with the fitting surface thereof is provided with a sealing groove 101 for clamping the sealing ring 3 or sealing material, and the sealing fitting surface 22 is a circular annular surface and is coaxially distributed with the sealing groove 101.

[0035] Optionally, the sealing fitting surface 22 is provided with a sealing groove 101 for clamping the sealing ring 3 or sealing material.

[0036] In this embodiment, the sealing groove 101 is used to stably mount the sealing ring 3; in the scheme that the sealing groove 101 is located on the outer circumferential surface of the cylinder 1, the cylinder 1 is moved to a position where the bottom end surface contacts the housing positioning surface 23 on the housing 2 to realize the assembly of the cylinder 1 and the housing 2, at this time, the sealing ring 3 is clamped between the sealing groove 101 of the cylinder 1 and the sealing fitting surface 22 to realize stable sealing;

[0037] Or, in the scheme that the sealing groove 101 is located on the sealing fitting surface 22 of the mounting groove, the sealing ring 3 is clamped in the sealing groove 101 of the mounting groove and realizes stable sealing between the sealing ring 3 and the outer circumferential surface of the cylinder 1, and the sealing ring 3 is not easy to be loosened.

[0038] The sealing groove 101 has a depth less than or equal to 50% of the wall thickness of the mounting groove of the cylinder 1 and the housing 2, so as to prevent the risk of failure of the cylinder 1 or the mounting groove of the housing 2 from being sharply increased due to the excessive depth of the groove.

[0039] Optionally, a guide inclined angle 21 is arranged at the opening of the lower part of the cylinder 1 and / or the mounting groove of the housing 2.

[0040] Embodiment Two

[0041] As shown in Figs. 1 and 2, the sealing structure of the present embodiment is provided with a stepped surface at the lower part of the cylinder 1 and a mounting groove on the housing 2. Figure 4 and Figure 5 The difference between the present embodiment and the first embodiment is that the housing positioning surface 23 is the top end surface of the housing 2 connected with the cylinder 1, and the stepped surface of the cylinder 1 abuts against the housing positioning surface 23 to realize the positioning of the assembly of the cylinder 1 and the housing 2. In the present embodiment, the bottom surface of the mounting groove has a gap with the bottom end surface of the cylinder 1, so as to only use the housing positioning surface 23 for the axial assembly positioning.

[0042] In the present embodiment, the sealing groove is arranged on the outer circumferential surface of the lower part of the cylinder 1, and the sealing ring 3 or the sealing material is clamped into the sealing groove to realize the sealing connection between the cylinder 1 and the housing 2. Alternatively, the sealing groove is arranged on the mounting and mating surface (the side surface of the mounting groove) of the mounting groove of the housing 2, and the sealing ring 3 or the sealing material is clamped into the sealing groove to realize the sealing connection between the cylinder 1 and the housing 2.

[0043] Embodiment Three

[0044] As shown in Figs. 1 and 2, the sealing structure of the present embodiment is provided with a stepped surface at the lower part of the cylinder 1 and a mounting groove on the housing 2. Figure 6 and Figure 7 The difference between the present embodiment and the first embodiment is that the housing positioning surface 23 is the top end surface of the housing 2 connected with the cylinder 1, and the stepped surface of the cylinder 1 abuts against the housing positioning surface 23 to realize the positioning of the assembly of the cylinder 1 and the housing 2. In the present embodiment, the bottom surface of the mounting groove has a gap with the bottom end surface of the cylinder 1, so as to only use the housing positioning surface 23 for the axial assembly positioning.

[0045] In the present embodiment, the sealing groove 101 is not arranged on the cylinder 1, but the sealing ring 3 is arranged between the mounting groove and the bottom end surface of the cylinder 1 to realize the sealing connection, so that the mounting groove of the housing 2 also has a certain positioning effect in addition to the housing positioning surface 23 of the top end surface of the housing 2, thereby ensuring the structural strength of the cylinder 1.

[0046] The above three embodiments can realize the assembly convenience of the cylinder 1 and the housing 2, and the sealing performance after the assembly is good, and the leakage and the airflow noise are not easy to occur.

[0047] Embodiment Four

[0048] This embodiment provides an air compressor, including a cylinder 1 and a housing 2. The cylinder 1 is sealed and assembled to the housing 1 through the sealing structure of the first, second or third embodiment. Figure 1 and Figure 2 The figure shows the connected part of the cylinder 1 and the housing 2. The housing 2 is used to connect the motor. A connecting rod connected to the motor output shaft is assembled in the housing 2. A piston is installed at the other end of the connecting rod and extends into the cylinder 1. The sealing structure of implementation one, two or three is adopted. Therefore, the air compressor has all the advantages and beneficial effects of the aforementioned embodiments.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A sealing structure for sealing a cylinder (1) to a housing (2), characterized in that: The housing (2) is provided with a mounting groove, which comprises: A housing positioning surface (23) abuts against the cylinder (1) to assemble and position the cylinder (1); A sealing mating surface (22) is sealed and connected to the cylinder (1).

2. The sealing structure according to claim 1, wherein: The housing positioning surface (23) is arranged on the bottom surface of the housing (2) mounting groove and abuts against the lower surface of the lower portion of the cylinder (1) to assemble and position the cylinder (1).

3. The sealing structure according to claim 1, wherein: The lower portion of the cylinder (1) is provided with a stepped surface, and the housing positioning surface (23) is provided on the top end surface of the housing (2) and abuts against the stepped surface of the lower portion of the cylinder (1) to assemble and position the cylinder (1).

4. The sealing structure according to any one of claims 1 to 3, characterized in that: The sealing matching surface (22) is arranged on the side of the mounting groove of the housing (2).

5. The sealing structure according to any one of claims 1 to 3, characterized in that: The sealing matching surface (22) is arranged on the bottom surface of the mounting groove of the housing (2).

6. The sealing structure according to claim 4, characterized in that: A sealing ring (3) or sealing material is provided between the sealing fitting surface (22) and the cylinder (1) to achieve a sealed connection between the cylinder (1) and the housing (2).

7. The sealing structure according to claim 5, characterized in that: A sealing ring (3) or sealing material is provided between the sealing fitting surface (22) and the cylinder (1) to achieve a sealed connection between the cylinder (1) and the housing (2).

8. The sealing structure according to claim 6, characterized in that: A sealing groove (101) is provided on the outer circumferential surface of the cylinder (1) or the inner side surface of the mounting groove of the housing (2) for accommodating a sealing ring (3) or a sealing material.

9. The sealing structure according to claim 7, characterized in that: A sealing groove (101) is provided on the outer circumferential surface of the cylinder (1) or the inner side surface of the mounting groove of the housing (2) for accommodating a sealing ring (3) or a sealing material.

10. The sealing structure according to claim 8, wherein: The depth of the sealing groove (101) is less than or equal to 50% of the wall thickness of the mounting groove of the cylinder (1) or the housing (2).

11. The sealing structure according to claim 8, characterized in that: The depth of the sealing groove (101) is less than or equal to 50% of the wall thickness of the mounting groove of the cylinder (1) or the housing (2).

12. The sealing structure according to claim 2, characterized in that: The lower portion of the cylinder (1) is provided with a stepped surface, and a gap exists between the stepped surface and the top end surface of the shell (2).

13. The sealing structure according to claim 3, characterized in that: There is a gap between the bottom surface of the installation groove and the lower surface of the lower part of the cylinder (1).

14. The sealing structure according to any one of claims 1 to 3 and 6 to 13, characterized in that: A guiding bevel (21) is provided at the lower portion of the cylinder (1) and / or the opening of the mounting groove of the housing (2).

15. An air compressor comprising a cylinder (1) and a housing (2), characterized in that: The cylinder (1) is sealed and assembled to the housing (2) by means of a sealing structure according to any one of claims 1 to 14.

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